CGI Programming FAQ: INDEX

The index is generated from an arbitrary list of keywords. If we've missed anything obvious please let us know.

APACHE

• What is the "CGI Overhead", and should I be worried about it?
• Can I identify users/sessions without password protection?
• Can I redirect users to another page?
• Are there some interactive debugging tools and services available?

ASP

• Should I use CGI or SSI or ... { PHP/ASP/... }
• So what are in a nutshell the options for webserver programming?

AUTHENTICATION

• Can I password-protect my pages?
• Can I do HTTP authentication using CGI?

BACKGROUND

• Can I run a CGI script without returning a new page to the browser?
• How can I avoid users hitting "submit" twice?

BASIC

• Basic Questions
• So what are in a nutshell the options for webserver programming?
• Do I have to use Perl?
• Can I verify the email addresses people enter in my Form?
• Can I launch a long process which the user interacts with?
• Can I password-protect my pages?
• Can I do HTTP authentication using CGI?
• How can I stop my CGI script reading and writing files as "nobody"?

BROWSER

• What is the "CGI Overhead", and should I be worried about it?
• What HTTP request headers can I use?
• What Environment variables are available to my application?
• What is the difference between GET and POST?
• Can I get information about who is visiting?
• Can I get browser details and return different pages?
• Can I trace where a user has come from/is going to?
• Can I launch a long process and return a page before it's finished?
• Can I do HTTP authentication using CGI?
• Can I identify users/sessions without password protection?
• Can I write output to several frames at once?
• How can I prevent my CGI results being cached by the browser?
• How can I control the default filename when downloading a file via CGI?
• I'm having trouble with my headers. What can I do?
• How can I run my CGI program 'live' in a debugger?
• I'm using CGI with QUERY_STRING embedded in my HTML, but it gets corrupted?

C

• Do I need to be on Unix?
• Do I have to use Perl?
• What languages should I know/use?
• What is the "CGI Overhead", and should I be worried about it?
• How can I stop my CGI script reading and writing files as "nobody"?
• Are there some interactive debugging tools and services available?
• How can I run my CGI program 'live' in a debugger?

CACHE

• Can I get browser details and return different pages?
• How can I prevent my CGI results being cached by the browser?

CERN

• Can I redirect users to another page?

CGI

• Where to get this document
• What's up with posting to comp.infosystems.www.authoring.cgi?
• Basic Questions
• What is CGI?
• Is it a script or a program?
• When do I need to use CGI?
• Should I use CGI or JAVA?
• Should I use CGI or SSI or ... { PHP/ASP/... }
• Should I use CGI or an API?
• So what are in a nutshell the options for webserver programming?
• What do I absolutely need to know?
• Do I have to use Perl?
• What languages should I know/use?
• Do I have to call it *.cgi? *.pl?
• What is the "CGI Overhead", and should I be worried about it?
• What do I need to know about file permissions and "chmod"?
• What is CGIWrap, and how does it affect my program?
• How do I decode the data in my Form?
• HTTP Headers and NPH Scripts
• What is HTTP (HyperText Transfer Protocol)?
• What HTTP request headers can I use?
• What HTTP response headers do I need to know about?
• What is the difference between GET and POST?
• Can I get the email of visitors?
• Can I trace where a user has come from/is going to?
• Can I do HTTP authentication using CGI?
• Can I identify users/sessions without password protection?
• Can I redirect users to another page?
• Can I run a CGI script without returning a new page to the browser?
• Can I write output to a different Netscape frame?
• Can I write output to several frames at once?
• How can I use Caches to make CGI scripts faster and more Net-friendly?
• How can I stop my CGI script reading and writing files as "nobody"?
• How can I prevent my CGI results being cached by the browser?
• How can I control the default filename when downloading a file via CGI?
• Troubleshooting a CGI application
• Are there some interactive debugging tools and services available?
• I'm having trouble with my headers. What can I do?
• Why do I get Error 500 ("the script misbehaved", or "Internal Server Error")
• I tried to use (Content-Type|Location|whatever), but it appears in my Browser?
• How can I run my CGI program 'live' in a debugger?
• I'm using CGI with QUERY_STRING embedded in my HTML, but it gets corrupted?
• Other FAQs/collections
• Reference Pages

CGIWRAP

• What do I need to know about file permissions and "chmod"?
• What is CGIWrap, and how does it affect my program?
• How can I stop my CGI script reading and writing files as "nobody"?
• Are there some interactive debugging tools and services available?

CHMOD

• What do I need to know about file permissions and "chmod"?
• How can I stop my CGI script reading and writing files as "nobody"?

COOKIE

• What HTTP response headers do I need to know about?
• Can I identify users/sessions without password protection?
• How can I avoid users hitting "submit" twice?

CREDENTIALS

• Can I do HTTP authentication using CGI?

DATABASE

• What is the "CGI Overhead", and should I be worried about it?
• What is the difference between GET and POST?
• How can I avoid users hitting "submit" twice?
• How can I stop my CGI script reading and writing files as "nobody"?

DEBUG

• Why do I get Error 500 ("the script misbehaved", or "Internal Server Error")
• How can I run my CGI program 'live' in a debugger?

EMAIL

• Where to get this document
• Can I get information about who is visiting?
• "But I saw some.kool.site display my email address..."
• Can I verify the email addresses people enter in my Form?

ENVIRONMENT

• So what are in a nutshell the options for webserver programming?
• What is HTTP (HyperText Transfer Protocol)?
• What HTTP request headers can I use?
• What is the difference between GET and POST?
• Can I get information about who is visiting?
• Subject: How can I get the hostname of the remote user?
• Can I get browser details and return different pages?
• How can I control the default filename when downloading a file via CGI?

ERROR

• Can I verify the email addresses people enter in my Form?
• Why do I get Error 500 ("the script misbehaved", or "Internal Server Error")
• I tried to use (Content-Type|Location|whatever), but it appears in my Browser?

EXPECT

• Can I email the author my questions?
• What is HTTP (HyperText Transfer Protocol)?
• Can I do HTTP authentication using CGI?
• How can I stop my CGI script reading and writing files as "nobody"?
• Are there some interactive debugging tools and services available?

FAQ

• Preamble
• Where to get this document
• Can I email the author my questions?
• What's up with posting to comp.infosystems.www.authoring.cgi?
• Credits
• What do I absolutely need to know?
• Does CGI create new security risks?
• Can I verify the email addresses people enter in my Form?
• How can I use Caches to make CGI scripts faster and more Net-friendly?
• Troubleshooting a CGI application
• How can I run my CGI program 'live' in a debugger?
• Other FAQs/collections

FORK

• Can I launch a long process and return a page before it's finished?
• Can I launch a long process which the user interacts with?

FRAMES

• Can I get browser details and return different pages?
• Can I write output to a different Netscape frame?
• Can I write output to several frames at once?
• Can I use a CGI script to generate both text and inline images?

GET

• Changes
• Can I email the author my questions?
• What do I absolutely need to know?
• How do I decode the data in my Form?
• What is HTTP (HyperText Transfer Protocol)?
• Why doesn't my script get REMOTE_USER? My page is password-protected.
• What is the difference between GET and POST?
• Can I get information about who is visiting?
• "But I saw some.kool.site display my email address..."
• Can I do HTTP authentication using CGI?
• Can I identify users/sessions without password protection?
• Can I redirect users to another page?
• Can I write output to several frames at once?
• Can I use a CGI script to generate both text and inline images?
• How can I prevent my CGI results being cached by the browser?
• I'm having trouble with my headers. What can I do?

HEAD

• What is HTTP (HyperText Transfer Protocol)?
• I'm having trouble with my headers. What can I do?

HEADER

• What's up with posting to comp.infosystems.www.authoring.cgi?
• HTTP Headers and NPH Scripts
• What is HTTP (HyperText Transfer Protocol)?
• What HTTP response headers do I need to know about?
• What is NPH?
• What is the difference between GET and POST?
• Can I get the email of visitors?
• Can I do HTTP authentication using CGI?
• Can I redirect users to another page?
• Can I run a CGI script without returning a new page to the browser?
• Can I write output to a different Netscape frame?
• How can I prevent my CGI results being cached by the browser?
• I'm having trouble with my headers. What can I do?
• Why do I get Error 500 ("the script misbehaved", or "Internal Server Error")
• I tried to use (Content-Type|Location|whatever), but it appears in my Browser?

HTML

• Where to get this document
• What is CGI?
• Should I use CGI or SSI or ... { PHP/ASP/... }
• So what are in a nutshell the options for webserver programming?
• What do I absolutely need to know?
• Does CGI create new security risks?
• What is CGIWrap, and how does it affect my program?
• How do I decode the data in my Form?
• What is HTTP (HyperText Transfer Protocol)?
• What HTTP request headers can I use?
• Can I get browser details and return different pages?
• Can I launch a long process and return a page before it's finished?
• Can I launch a long process which the user interacts with?
• Can I password-protect my pages?
• Can I do HTTP authentication using CGI?
• Can I run a CGI script without returning a new page to the browser?
• How can I control the default filename when downloading a file via CGI?
• Troubleshooting a CGI application
• I'm having trouble with my headers. What can I do?
• Why do I get Error 500 ("the script misbehaved", or "Internal Server Error")
• I'm using CGI with QUERY_STRING embedded in my HTML, but it gets corrupted?
• Other FAQs/collections
• Reference Pages

HTTP

• Where to get this document
• What is CGI?
• What do I absolutely need to know?
• Does CGI create new security risks?
• What is the "CGI Overhead", and should I be worried about it?
• What is CGIWrap, and how does it affect my program?
• How do I decode the data in my Form?
• HTTP Headers and NPH Scripts
• What is HTTP (HyperText Transfer Protocol)?
• What HTTP request headers can I use?
• What HTTP response headers do I need to know about?
• What is NPH?
• Must/should/can I write nph scripts?
• What is the difference between GET and POST?
• Can I verify the email addresses people enter in my Form?
• Can I trace where a user has come from/is going to?
• Can I do HTTP authentication using CGI?
• Can I identify users/sessions without password protection?
• Can I run a CGI script without returning a new page to the browser?
• How can I use Caches to make CGI scripts faster and more Net-friendly?
• How can I prevent my CGI results being cached by the browser?
• How can I control the default filename when downloading a file via CGI?
• Troubleshooting a CGI application
• Are there some interactive debugging tools and services available?
• I'm having trouble with my headers. What can I do?
• Why do I get Error 500 ("the script misbehaved", or "Internal Server Error")
• I'm using CGI with QUERY_STRING embedded in my HTML, but it gets corrupted?
• Other FAQs/collections
• Reference Pages

HTTPD

• Should I use CGI or SSI or ... { PHP/ASP/... }
• Should I use CGI or an API?
• What do I absolutely need to know?
• What is HTTP (HyperText Transfer Protocol)?
• What HTTP response headers do I need to know about?
• What is NPH?
• Must/should/can I write nph scripts?
• Can I trace where a user has come from/is going to?
• Can I password-protect my pages?
• Can I do HTTP authentication using CGI?
• Can I redirect users to another page?
• How can I stop my CGI script reading and writing files as "nobody"?
• I tried to use (Content-Type|Location|whatever), but it appears in my Browser?

IMAGE

• Can I use a CGI script to generate both text and inline images?

JAVA

• Should I use CGI or JAVA?
• So what are in a nutshell the options for webserver programming?
• Can I launch a long process which the user interacts with?

JAVASCRIPT

• Can I get information about who is visiting?
• Can I trace where a user has come from/is going to?
• Can I write output to several frames at once?

LOCATION

• What HTTP response headers do I need to know about?
• Must/should/can I write nph scripts?
• Can I redirect users to another page?
• Why do I get Error 500 ("the script misbehaved", or "Internal Server Error")

MICROSOFT

• Should I use CGI or SSI or ... { PHP/ASP/... }
• Can I get browser details and return different pages?

MOZILLA

• Can I get browser details and return different pages?

MULTIPART

• How do I decode the data in my Form?

NCSA

• What is CGI?
• Should I use CGI or SSI or ... { PHP/ASP/... }
• What do I absolutely need to know?
• What HTTP request headers can I use?
• What Environment variables are available to my application?
• Do I have to call it nph-*
• Can I get information about who is visiting?
• Reference Pages

NETSCAPE

• What HTTP response headers do I need to know about?
• Can I get information about who is visiting?
• Can I get browser details and return different pages?
• Can I trace where a user has come from/is going to?
• Can I write output to a different Netscape frame?

NOBODY

• What do I need to know about file permissions and "chmod"?
• How can I stop my CGI script reading and writing files as "nobody"?

NPH

• HTTP Headers and NPH Scripts
• What HTTP response headers do I need to know about?
• What is NPH?
• Must/should/can I write nph scripts?
• Do I have to call it nph-*
• Can I do HTTP authentication using CGI?
• Can I run a CGI script without returning a new page to the browser?

PASSWORD

• Why doesn't my script get REMOTE_USER? My page is password-protected.
• Can I do HTTP authentication using CGI?

PERL

• Do I need to be on Unix?
• Do I have to use Perl?
• What languages should I know/use?
• What is the "CGI Overhead", and should I be worried about it?
• What do I need to know about file permissions and "chmod"?
• Can I verify the email addresses people enter in my Form?
• Can I write output to several frames at once?
• How can I use Caches to make CGI scripts faster and more Net-friendly?
• How can I stop my CGI script reading and writing files as "nobody"?
• Troubleshooting a CGI application
• Are there some interactive debugging tools and services available?
• Other FAQs/collections

PERMISSIONS

• What do I need to know about file permissions and "chmod"?
• What is CGIWrap, and how does it affect my program?
• Why do I get Error 500 ("the script misbehaved", or "Internal Server Error")

PHP

• Should I use CGI or SSI or ... { PHP/ASP/... }
• So what are in a nutshell the options for webserver programming?

POST

• Can I email the author my questions?
• What's up with posting to comp.infosystems.www.authoring.cgi?
• How do I decode the data in my Form?
• What is HTTP (HyperText Transfer Protocol)?
• What is the difference between GET and POST?
• Can I identify users/sessions without password protection?
• How can I control the default filename when downloading a file via CGI?

PRAGMA

• How can I prevent my CGI results being cached by the browser?

REDIRECT

• What HTTP response headers do I need to know about?
• Can I redirect users to another page?

REFRESH

• What HTTP response headers do I need to know about?

REQUEST

• What is HTTP (HyperText Transfer Protocol)?
• What HTTP request headers can I use?
• What is the difference between GET and POST?
• Can I launch a long process which the user interacts with?
• Can I redirect users to another page?
• Can I use a CGI script to generate both text and inline images?
• How can I prevent my CGI results being cached by the browser?
• I'm having trouble with my headers. What can I do?

RESPONSE

• Should I use CGI or SSI or ... { PHP/ASP/... }
• What languages should I know/use?
• What is HTTP (HyperText Transfer Protocol)?
• What HTTP response headers do I need to know about?
• What is NPH?
• Can I launch a long process which the user interacts with?
• Can I do HTTP authentication using CGI?
• Can I redirect users to another page?
• Can I use a CGI script to generate both text and inline images?
• How can I avoid users hitting "submit" twice?
• How can I control the default filename when downloading a file via CGI?
• I'm having trouble with my headers. What can I do?

SECURITY

• What do I absolutely need to know?
• Does CGI create new security risks?
• What do I need to know about file permissions and "chmod"?
• What is CGIWrap, and how does it affect my program?
• How can I stop my CGI script reading and writing files as "nobody"?
• Other FAQs/collections

SERVER

• Where to get this document
• Should I use CGI or JAVA?
• Should I use CGI or SSI or ... { PHP/ASP/... }
• So what are in a nutshell the options for webserver programming?
• What do I absolutely need to know?
• Do I have to call it *.cgi? *.pl?
• What is the "CGI Overhead", and should I be worried about it?
• What do I need to know about file permissions and "chmod"?
• What is CGIWrap, and how does it affect my program?
• What is HTTP (HyperText Transfer Protocol)?
• What HTTP request headers can I use?
• What Environment variables are available to my application?
• What HTTP response headers do I need to know about?
• Do I have to call it nph-*
• What is the difference between GET and POST?
• Subject: How can I get the hostname of the remote user?
• Can I launch a long process which the user interacts with?
• Can I do HTTP authentication using CGI?
• Can I identify users/sessions without password protection?
• Can I write output to several frames at once?
• How can I stop my CGI script reading and writing files as "nobody"?
• How can I prevent my CGI results being cached by the browser?
• How can I control the default filename when downloading a file via CGI?
• I'm having trouble with my headers. What can I do?
• Why do I get Error 500 ("the script misbehaved", or "Internal Server Error")

SSI

• Should I use CGI or SSI or ... { PHP/ASP/... }
• So what are in a nutshell the options for webserver programming?

STATUS

• What HTTP response headers do I need to know about?
• Must/should/can I write nph scripts?
• Can I do HTTP authentication using CGI?
• Can I run a CGI script without returning a new page to the browser?
• Why do I get Error 500 ("the script misbehaved", or "Internal Server Error")

TCL

• Do I have to use Perl?
• What languages should I know/use?
• How can I stop my CGI script reading and writing files as "nobody"?
• Are there some interactive debugging tools and services available?

UNIX

• Do I need to be on Unix?
• What do I need to know about file permissions and "chmod"?
• What HTTP request headers can I use?
• Can I launch a long process and return a page before it's finished?
• How can I run my CGI program 'live' in a debugger?

URL

• Where to get this document
• What do I absolutely need to know?
• What is CGIWrap, and how does it affect my program?
• What is the difference between GET and POST?
• Can I identify users/sessions without password protection?
• Can I redirect users to another page?
• Can I write output to several frames at once?
• Can I use a CGI script to generate both text and inline images?
• How can I prevent my CGI results being cached by the browser?
• How can I control the default filename when downloading a file via CGI?

URLENCODE

• Can I redirect users to another page?

WWW

• Where to get this document
• What's up with posting to comp.infosystems.www.authoring.cgi?
• Should I use CGI or JAVA?
• What do I absolutely need to know?
• Does CGI create new security risks?
• Do I have to use Perl?
• What is CGIWrap, and how does it affect my program?
• Must/should/can I write nph scripts?
• What is the difference between GET and POST?
• Can I verify the email addresses people enter in my Form?
• Can I do HTTP authentication using CGI?
• Troubleshooting a CGI application
• Are there some interactive debugging tools and services available?
• I'm having trouble with my headers. What can I do?
• Other FAQs/collections
• Reference Pages

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